Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
han thai » han tai, ban thai, van thai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
thai va » thai van
xuc va » tuc va, luc va, xac va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (tu sach)) ky nang xa hoi. hieu van cham ((xuc va) OR (duc va)) han thai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (tu sach)) ky nang xa hoi. hieu van cham ((xuc va) OR (duc va)) han thai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu hoach) or (tu sach)) ky nang xa hoi. hieu van cham ((xuc va) OR (duc va)) han thai va thiet".
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (tu sach)) ky nang xa hoi. hieu van cham ((xuc va) OR (duc va)) han thai va thiet*.