Perhaps you should try some spelling variations:
su triet » su tien, ve triet
su sach » so sach, vu sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
su viet » so viet
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang ma hoi. hieu ((ve cam) or (ve cac)) truc va hanh va ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoi. hieu ((ve cam) OR (ve cac)) truc va hanh va ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoi. hieu ((ve cam) or (ve cac)) truc va hanh va ((su triet) or (su viet))*.