Perhaps you should try some spelling variations:
su triet » su viet, su tien
ve triet » va trien
hanh lai » hanh lam, hanh tai, thanh lap
sach ty » sach y, sach tu, sach thu
xa hanh » xa thanh, xa khanh, va hanh
cam tuc » cam xuc, cam tu, nam thuc
bo sach » co sach, hoc sach
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ty nang ((ma hoi) or (xa hoi)). hieu ve cam tuc xa hanh lai ((ve triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty nang ((ma hoi) OR (xa hoi)). hieu ve cam tuc xa hanh lai ((ve triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty nang ((ma hoi) or (xa hoi)). hieu ve cam tuc xa hanh lai ((ve triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: bo sach ty nang ((ma hoi) or (xa hoi)). hieu ve cam tuc xa hanh lai ((ve triet) OR (su triet))*.