Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang ((ma hoi) or (xa hoi)). hieu van cac xuc van hanh ((dai cua) or (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((ma hoi) OR (xa hoi)). hieu van cac xuc van hanh ((dai cua) OR (lai chau)) tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((ma hoi) or (xa hoi)). hieu van cac xuc van hanh ((dai cua) or (lai chau)) tre*.