Perhaps you should try some spelling variations:
tri nang » thi nang, tra nang, tri bang
hieu toc » hieu hoc, hieu tuc, sieu toc
toc cham » toc thai
duc manh » suc manh, duc anh, duc minh
ve triet » va trien, su triet
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc phan
hanh de » hanh ve, hanh kem

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)) tri nang xa hoi. hieu toc cham ((duc van) OR (duc manh)) hanh de ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) tri nang xa hoi. hieu toc cham ((duc van) OR (duc manh)) hanh de ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) tri nang xa hoi. hieu toc cham ((duc van) OR (duc manh)) hanh de ve triet*".