Perhaps you should try some spelling variations:
thanh cac » hanh cac, thanh bac, tranh cac
thanh ca » thanh cha, thanh ha, thanh va
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, hoc sach
nam luc » nang luc, nhan luc, nam thuc
mai hoi » mai khoi, dai hoi, lai hoi
co sach » bo sach, cuon sach, hoc sach
luc va » duc va, tuc va, loc va
y nang » ky nang, ly nang, v nang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (co sach)) y nang mai hoi. hieu van nam luc va ((thanh cac) OR (thanh ca)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) y nang mai hoi. hieu van nam luc va ((thanh cac) OR (thanh ca)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (co sach)) y nang mai hoi. hieu van nam luc va ((thanh cac) OR (thanh ca)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) y nang mai hoi. hieu van nam luc va ((thanh cac) OR (thanh ca)) cua te*.