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

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 tuan hoi ((cua tu) OR (cua cu))~.
• 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 tuan hoi ((cua tu) OR (cua cu)).
• 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 tuan hoi ((cua tu) OR (cua cu))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang co loi. hieu ve pham duc van tuan hoi ((cua tu) OR (cua cu))*.