Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
va tinh » may tinh
tinh de » tinh da, sinh de, tinh he
tu sach » thu sach, su sach, te sach
ma hoi » xa hoi, ma hoa, me hoi
tuc va » thuc va, truc va, tuc xa
de cua » le cua, te cua, dieu cua

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 nang ((ma hoi) or (mai hoi)). hieu van cam tuc va tinh de cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang ((ma hoi) OR (mai hoi)). hieu van cam tuc va tinh de cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang ((ma hoi) or (mai hoi)). hieu van cam tuc va tinh de cua viet*.