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

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) OR (bo sach)))) y nang ma hoi. lieu va cau tuc va dan khai dung tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (((so sach) OR (bo sach)))) y nang ma hoi. lieu va cau tuc va dan khai dung tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (((so sach) OR (bo sach)))) y nang ma hoi. lieu va cau tuc va dan khai dung tren*".