Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
te cua » le cua, de cua

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