Perhaps you should try some spelling variations:
thi cong » tai cong, thien cong
nam duoc » nam thuoc, da duoc, dat duoc
duoc ban » duc ban, quoc ban, buoc ban
ban hanh » ban hang
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach v nang xa hoi. ((lieu va) or (thi cong)) nam duoc ban hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang xa hoi. ((lieu va) OR (thi cong)) nam duoc ban hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. ((lieu va) or (thi cong)) nam duoc ban hanh dai cua tre*.