Perhaps you should try some spelling variations:
dan khai » dang khai, van khai, dang khoi
khai hau » khi hau, khac hau, hai hau
hau tren » dau tren, cau tren, thai tren
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
cau tuc » cau truc, cau tu, cau luc
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cau » van cau, va cac, va dau
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau

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 ma hoi. lieu va cau tuc va dan khai hau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang ma hoi. lieu va cau tuc va dan khai hau tren*.