Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
te sach » toc sach
han tai » hang tai, nhan tai, van tai
tu sach » thu sach, su sach, tu cach
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
tai va » thai va, mai va, tri va

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 (te sach)) ky nang xa hoi. hieu van cham ((xac va) or (tuc va)) han tai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang xa hoi. hieu van cham ((xac va) OR (tuc va)) han tai va thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang xa hoi. hieu van cham ((xac va) or (tuc va)) han tai va thieu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang xa hoi. hieu van cham ((xac va) or (tuc va)) han tai va thieu*.