Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
nang de » nang du, vang de, dang de
hieu ve » hieu va
va nang » van nang, da nang, cam nang
de cua » le cua, te cua, dieu cua
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
ma hoi » mai hoi, xa hoi, ma hoa

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 (su sach)) ky tang ma hoi. ((hieu ve) OR (hieu van)) cam tuc va nang de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky tang ma hoi. ((hieu ve) OR (hieu van)) cam tuc va nang de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ky tang ma hoi. ((hieu ve) OR (hieu van)) cam tuc va nang de cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky tang ma hoi. ((hieu ve) OR (hieu van)) cam tuc va nang de cua te*.