Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh thi » thanh tai, nhanh thi, thanh tri
nam thuc » nam thuoc, am thuc, nam thu
thuc gia » thuc giai, thue gia, thuc dia
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
thi dau » thi dai, phi dau, thi dan
va nam » van nam, ha nam, va nay
x hoi » xa hoi, o hoi, 5 hoi

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) or (thuat sach)) ky nang ((x hoi) or (x ho)). hieu va nam thuc gia thanh thi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang ((x hoi) OR (x ho)). hieu va nam thuc gia thanh thi dau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang ((x hoi) or (x ho)). hieu va nam thuc gia thanh thi dau tren*.