Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cuc tre » duc tre, cua tre, cuu tre
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau

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) or (thu hoach)) ky sang ma hoi. hieu van cam tuc ((va dan) or (va hanh)) tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky sang ma hoi. hieu van cam tuc ((va dan) OR (va hanh)) tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky sang ma hoi. hieu van cam tuc ((va dan) or (va hanh)) tai cuc tre*.