Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc gia » thuc giai, thue gia, thuc dia
gia nhan » giao nhan, gia nhap, gia thanh
nhan tai » hang tai, van tai, toan tai
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
tai dau » tac dau, tai du, thi dau
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 san)) ky nang ((x hoi) or (x ho)). hieu van nam thuc gia nhan tai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat san)) ky nang ((x hoi) OR (x ho)). hieu van nam thuc gia nhan tai dau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat san)) ky nang ((x hoi) or (x ho)). hieu van nam thuc gia nhan tai dau tren*.