Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
lai cau » lai chau, lai cam, loi cau
va hanh » van hanh, va thanh, va danh
hoc duc » hoc duoc, hoc nuoc, hoc thuc
hac duc » ha duc, thach duc, pham duc
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang

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 ((ty nang) OR (ty hang)) xa hoi. hieu van ((hac duc) or (hoc duc)) va hanh lai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) xa hoi. hieu van ((hac duc) OR (hoc duc)) va hanh lai cau triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty hang)) xa hoi. hieu van ((hac duc) or (hoc duc)) va hanh lai cau triet*".