Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
ky hang » ky nang, ly hang, ky dang
dau hoi » dai hoi, dan hoi, dau noi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
luy tre » luyen tre
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky hang ((dau hoi) OR (cau hoi)). hieu ve pham duc va thanh va ((luu tru) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky hang ((dau hoi) OR (cau hoi)). hieu ve pham duc va thanh va ((luu tru) OR (luy tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky hang ((dau hoi) OR (cau hoi)). hieu ve pham duc va thanh va ((luu tru) or (luy tre))".
• Adding a wildcard symbol may retrieve word variants: te sac ky hang ((dau hoi) OR (cau hoi)). hieu ve pham duc va thanh va ((luu tru) or (luy tre))*.