Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
hieu van » thien van, lieu va, hieu ve
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
lam cuu » lam chu, lam cua, cham cuu
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

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