Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
vai cua » dai cua, hai cua, lai cua
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dap
va dau » va dao
cua te » cua tu

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 y nang ma hoa. ((hieu van) or (hieu va)) cam tuc ((va dan) or (va dau)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ma hoa. ((hieu van) OR (hieu va)) cam tuc ((va dan) OR (va dau)) vai cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ma hoa. ((hieu van) or (hieu va)) cam tuc ((va dan) or (va dau)) vai cua te*.