Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
sach ty » sach tu, sach thu, xach tay
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cac tuc » cac toc, cac tac, cac nuoc
cua tuc » cua duc, cua tu, cua thuoc
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
cac tu » cac thu, cach tu, cac du

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 ty) or (sach y)) nang cao hoi. hieu ve ((cac tuc) OR (cac tu)) va danh vai cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang cao hoi. hieu ve ((cac tuc) OR (cac tu)) va danh vai cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) nang cao hoi. hieu ve ((cac tuc) OR (cac tu)) va danh vai cua tuc".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang cao hoi. hieu ve ((cac tuc) OR (cac tu)) va danh vai cua tuc*.