Perhaps you should try some spelling variations:
sach tay » sach hay, sach nay, sach tai
xach tay » canh tay
van dung » van dong, xay dung, tin dung
van hoi » van hoa, van hoc, van loi
van hoe » van hoa, van hoc, van hieu
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
tac van » tac vang, cac van, tac va
cuc te » cua te, cuc thue, cuc tieu

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 tay) or (xach tay)) lang ((van hoi) OR (van hoe)). hieu va cac tac van dung tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tay) OR (xach tay)) lang ((van hoi) OR (van hoe)). hieu va cac tac van dung tai cuc te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tay) or (xach tay)) lang ((van hoi) OR (van hoe)). hieu va cac tac van dung tai cuc te*".