Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » thien van, lieu va, hieu ve
thu nang » thi nang, thu hang, thu bang
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hac duc » hoc duc, ha duc, thach duc
vai cua » dai cua, hai cua, lai cua
duc van » duc va, duc tan, duc manh
te sach » toc sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuoc sach)) thu nang ma hoi. ((hieu van) OR (hieu va)) hac duc van hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) thu nang ma hoi. ((hieu van) OR (hieu va)) hac duc van hanh vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) thu nang ma hoi. ((hieu van) OR (hieu va)) hac duc van hanh vai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) thu nang ma hoi. ((hieu van) OR (hieu va)) hac duc van hanh vai cua tu*.