Perhaps you should try some spelling variations:
sach tay » sach hay, sach nay, sach tai
xach tay » canh tay
lang van » dang van, tang van, hoang van
van hoc » van hoa
hieu va » lieu va, hieu qua
cac duc » cao duc, cac dac, cac nuoc
va dung » van dung, va duong, vat dung
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: thu ((sach tay) OR (xach tay)) lang van hoc. hieu va ((cac duc) or (cac du)) va dung tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach tay) OR (xach tay)) lang van hoc. hieu va ((cac duc) OR (cac du)) va dung tai cuc te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach tay) OR (xach tay)) lang van hoc. hieu va ((cac duc) or (cac du)) va dung tai cuc te*".