Perhaps you should try some spelling variations:
cau triet » cau trieu, cua triet, va triet
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
hoc duc » hoc duoc, hoc nuoc, hoc thuc
va hanh » van hanh, va thanh, va danh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hac duc » ha duc, thach duc, pham duc
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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: te sach ty nang xa hoi. hieu van ((hac duc) OR (hoc duc)) va hanh tai ((cau triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. hieu van ((hac duc) or (hoc duc)) va hanh tai ((cau triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu van ((hac duc) or (hoc duc)) va hanh tai ((cau triet) OR (su triet))*.