Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thue va » thuc va, thuyet va, thuc vat
ma thue » ma thu, dan thue, lam thue
hieu he » hieu ve, hiem he, hieu hien
vu sach » vu bach, vu khach
hieu le » hieu ve, hieu ly, tieu le
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
su sach » so sach
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) ty nang cao hoi. ((hieu le) or (hieu he)) ma thue va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ty nang cao hoi. ((hieu le) OR (hieu he)) ma thue va hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ty nang cao hoi. ((hieu le) or (hieu he)) ma thue va hanh di cua viet*.