Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, nam thuc, dam thuc
su sach » so sach, vu sach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
doi cua » dai cua, hoi cua
ma hoi » mai hoi, xa hoi, ma hoa
cam tu » cam thu, nam tu, dam tu

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 tang ma hoi. hieu van ((cam tuc) or (cam tu)) gia thanh doi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu hoach)) ky tang ma hoi. hieu van ((cam tuc) OR (cam tu)) gia thanh doi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu hoach)) ky tang ma hoi. hieu van ((cam tuc) or (cam tu)) gia thanh doi cua vat*.