Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
danh hai » dang hai, lanh hai, manh hai
hai cau » hai chau, hai chu, hai hau
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
tuc va » thuc va, truc va, duc va
y nang » ky nang, ly nang, v nang

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) or (so sach)) y nang xa hoi. hieu van cau ((tuc va) OR (tuc xa)) danh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang xa hoi. hieu van cau ((tuc va) OR (tuc xa)) danh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang xa hoi. hieu van cau ((tuc va) OR (tuc xa)) danh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang xa hoi. hieu van cau ((tuc va) OR (tuc xa)) danh hai cau treo*.