Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
thi cham » thi hai, toc cham, thi ha
hieu thi » sieu thi, hieu chi, hiep thi
hoc noi » hoc nuoc
sach tu » sach thu, cach tu, sach ty
hoc hoi » hoc khoi, hoc hoa, hoc moi
truc va » thuc va, thuc vat, trung va
va phan » van phan, va phat, va phap
tu nang » tru nang, tu nong, tu nano
tu sach » thu sach, su sach, te sach
lap su » lap du, lap tu, lap so

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ((hoc hoi) OR (hoc noi)). hieu thi cham truc va phan ((lap su) OR (lai su)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang ((hoc hoi) or (hoc noi)). hieu thi cham truc va phan ((lap su) OR (lai su)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((hoc hoi) or (hoc noi)). hieu thi cham truc va phan ((lap su) OR (lai su)) triet*.