Perhaps you should try some spelling variations:
dan khai » dang khai, van khai, dang khoi
khai dua » khi dua, khai quat, khai tuan
dua tren » dung tren
su sach » so sach, vu sach
so sanh » do sanh
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 sanh)) y nang ma hoi. lieu va cau tuc va dan khai dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) y nang ma hoi. lieu va cau tuc va dan khai dua tren*.