Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
ca viet » va viet, co viet, hoa viet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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

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