Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dau tren » dau tien, dat tren, dau tieng
tai hai » thi hai, dai hai, tai phan
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
y sang » _ sang, duy sang
tai ha » thai ha, tai nha, thi ha
tuc va » thuc va, truc va, tuc xa
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 y sang ((tai hai) OR (tai ha)). hieu qua cac tuc va hanh vi dau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y sang ((tai hai) OR (tai ha)). hieu qua cac tuc va hanh vi dau tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach y sang ((tai hai) OR (tai ha)). hieu qua cac tuc va hanh vi dau tren*.