Perhaps you should try some spelling variations:
tuan hoi » tan hoi, quang hoi, tuan hoan
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc van » duc tan, duc manh, duc phan
hoi cua » hoi chuc
co loi » co hoi
cua tu » cua tuc, cua su, cua cu

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 (vu sach)) ky nang co loi. hieu ve pham ((duc van) OR (duc va)) tuan hoi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang co loi. hieu ve pham ((duc van) OR (duc va)) tuan hoi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang co loi. hieu ve pham ((duc van) OR (duc va)) tuan hoi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang co loi. hieu ve pham ((duc van) OR (duc va)) tuan hoi cua tu*.