Perhaps you should try some spelling variations:
ve triet » va trien, su triet
dan khai » dang khai, van khai, dang khoi
hieu van » hieu va, thien van, lieu va
sach tu » sach thu, cach tu, sach ty
dan hai » doan hai, dang hai, van hai
tu sach » thu sach, su sach, te sach
hoc tuc » hoc thuc, hoc truc, hoc duc
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
hoc tu » hoc thuc

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