Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thi cong » tai cong, thien cong
van hanh » van thanh, ban hanh, van anh
hanh de » hanh ve, hanh kem
xuc van » duc van, luc van, vuc van
nam xuc » cam xuc, nam xua, nam thuc
cua tre » cua te, cuu tre, cua triet
thi van » thi lan, thi hanh, thi nang
xay hoi » tay hoi, cay phoi, gay thoi
sach o » sach lo, sac o, sach y
de cua » le cua, te cua, dieu cua
o van » vo van, so van, do van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach o van ((xay hoi) OR (xa hoi)). ((thi van) or (thi cong)) nam xuc van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach o van ((xay hoi) OR (xa hoi)). ((thi van) OR (thi cong)) nam xuc van hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach o van ((xay hoi) OR (xa hoi)). ((thi van) or (thi cong)) nam xuc van hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach o van ((xay hoi) OR (xa hoi)). ((thi van) or (thi cong)) nam xuc van hanh de cua tre*.