Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thi nang » thi cong, ki nang, thi hanh
van hanh » van thanh, ban hanh, van anh
kem cua » em cua, keo cua, diem cua
xuc van » duc van, luc van, vuc van
nam xuc » cam xuc, nam xua, nam thuc
thi van » thi lan, thi hanh
tay hoi » tay ho, tao hoi, tay thai
xay hoi » xa hoi, cay phoi, gay thoi
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sac o, sach y
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 (tay hoi)). ((thi van) or (thi nang)) nam xuc van hanh kem cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach o van ((xay hoi) OR (tay hoi)). ((thi van) OR (thi nang)) nam xuc van hanh kem cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach o van ((xay hoi) OR (tay hoi)). ((thi van) or (thi nang)) nam xuc van hanh kem cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach o van ((xay hoi) OR (tay hoi)). ((thi van) or (thi nang)) nam xuc van hanh kem cua tre*.