Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cam tuc » cam xuc, cam tu, nam thuc
xa hanh » xa thanh, xa khanh, va hanh
cua tuc » cua duc, cua tu, cua thuoc
ma hoi » mai hoi, xa hoi, ma hoa
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ma hoi. ((hieu van) or (lieu va)) cam tuc xa hanh vi ((cua tuc) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. ((hieu van) OR (lieu va)) cam tuc xa hanh vi ((cua tuc) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. ((hieu van) or (lieu va)) cam tuc xa hanh vi ((cua tuc) or (cua su))*.