Perhaps you should try some spelling variations:
thien van » thi van
cua viet » hoa viet, cua vat, cua dieu
thu sach » thuat sach, thuoc sach, thu hoach
hanh dai » hanh tai, hanh dao, vanh dai
xa hanh » xa thanh, xa khanh, va hanh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
tu sach » su sach, te sach, tu cach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, ma hoa

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 sach)) ky tang ma hoi. thien van cam tuc xa hanh dai ((cua viet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky tang ma hoi. thien van cam tuc xa hanh dai ((cua viet) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky tang ma hoi. thien van cam tuc xa hanh dai ((cua viet) or (ca viet))*.