Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
nhan luc » nang luc
toc sach » hoc sach, doc sach, thuoc sach
dan dau » danh dau, doan dau, van dau
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ve nhan » ve nha, de nhan, va nhan
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 7 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) y tang ma hoi. hieu ve nhan luc va dan dau ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y tang ma hoi. hieu ve nhan luc va dan dau ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y tang ma hoi. hieu ve nhan luc va dan dau ((cua triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y tang ma hoi. hieu ve nhan luc va dan dau ((cua triet) or (su triet))*.