Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
hang tai » hang va, dung tai
su triet » su tien, ve triet
tu sach » thu sach, su sach, tu cach
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
hieu vu » hieu va, hieu ve, hieu su
tai hai » thi hai, dai hai, tai ha
ly hang » ly quang
te sach » toc sach
su viet » so viet

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)) ly hang tai hai. hieu vu cham truc va hanh vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ly hang tai hai. hieu vu cham truc va hanh vi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ly hang tai hai. hieu vu cham truc va hanh vi ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ly hang tai hai. hieu vu cham truc va hanh vi ((su triet) or (su viet))*.