Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thi nang » thi cong, ki nang
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam thu
thi hanh » thi thanh
nam xuc » cam xuc, nam xua, nam duoc
xay hoi » xa hoi, tay hoi, cay phoi
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
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. ((thi hanh) or (thi nang)) ((nam xuc) OR (nam thuc)) van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach o van xay hoi. ((thi hanh) OR (thi nang)) ((nam xuc) OR (nam thuc)) van hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach o van xay hoi. ((thi hanh) or (thi nang)) ((nam xuc) OR (nam thuc)) van hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach o van xay hoi. ((thi hanh) or (thi nang)) ((nam xuc) OR (nam thuc)) van hanh de cua tre*.