Perhaps you should try some spelling variations:
thang vai » thang va, trang vai, hang va
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
thuc tat » thuc tap, thuc tai, tuc tat
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
va cham » va chat, va tham
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: so sach ((thu nang) or (thu hang)) ma hoi. hieu va cham ((thuc tat) OR (thuc vat)) thang vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu nang) OR (thu hang)) ma hoi. hieu va cham ((thuc tat) OR (thuc vat)) thang vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((thu nang) or (thu hang)) ma hoi. hieu va cham ((thuc tat) OR (thuc vat)) thang vai cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach ((thu nang) or (thu hang)) ma hoi. hieu va cham ((thuc tat) OR (thuc vat)) thang vai cua tu*.