Perhaps you should try some spelling variations:
dang tri » dang thi, dung tri, dong tri
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
van hac » van ha, van hai, van chat
van hoc » van hoa
va dang » van dang, va nang, va lang
cua tu » cua tuc, cua su, cua cu
nuoc » quoc, duoc, ngoc

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 ty) or (sach y)) nang xa hoi. hieu ((van hac) OR (van hoc)) nuoc va dang tri cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ty) OR (sach y)) nang xa hoi. hieu ((van hac) OR (van hoc)) nuoc va dang tri cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ty) or (sach y)) nang xa hoi. hieu ((van hac) OR (van hoc)) nuoc va dang tri cua tu".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ty) or (sach y)) nang xa hoi. hieu ((van hac) OR (van hoc)) nuoc va dang tri cua tu*.