Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
khai dung » khai ung, hai dung, kha dung
dao khai » dao khau, cao khai, dan khai
nang mai » nang ma, nang tai, lang mai
truc va » thuc va, thuc vat, trung va
su sach » vu sach
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
va cau » van cau, va cac, va dau
tuc va » thuc va, tuc xa, 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 mai hoi. lieu va cau ((tuc va) OR (truc va)) dao khai dung tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang mai hoi. lieu va cau ((tuc va) OR (truc va)) dao khai dung tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang mai hoi. lieu va cau ((tuc va) OR (truc va)) dao khai dung tren*".