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

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 thu va hanh doi 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 thu va hanh doi 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 thu va hanh doi cua viet*.