Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
su triet » su viet, su tien, ve triet
phan lap » phan dau
va phan » van phan, va phat, va phap
truc va » thuc va, thuc vat, trung va
tu cham » toc cham, thi cham
hieu tu » chieu tu, hieu tuc, hien tu
tu sach » thu sach, su sach, te sach
hoc hoi » hoc khoi, hoc hoa, hoc moi
ty nang » ky nang, ty hang, ly nang
hoc noi » hoc nuoc
lap su » lap du, lap tu, lai su

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 ((ty nang) OR (ty xang)) ((hoc hoi) OR (hoc noi)). hieu tu cham truc va phan lap su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty xang)) ((hoc hoi) or (hoc noi)). hieu tu cham truc va phan lap su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty xang)) ((hoc hoi) or (hoc noi)). hieu tu cham truc va phan lap su triet*.