Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
sang tai » hang tai, sang tao, tang tai
dau tren » dau tien, dat tren, dau tieng
tai hai » thi hai, dai hai, tai ha
qua cac » cua cac
cac toc » cac toi, cac nuoc, cac thoi
va hanh » van hanh, va thanh, va danh
y sang » _ sang, duy sang
toc va » hoc va, toc ta, tuc va
vi dau » vi dai, va dau, bi dau

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) or (thuat lanh)) y sang tai hai. hieu qua cac toc va hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat lanh)) y sang tai hai. hieu qua cac toc va hanh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (thuat lanh)) y sang tai hai. hieu qua cac toc va hanh vi dau tren*.