Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
luu hanh » huu han
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
luu van » cuu van, luan van
te sach » toc sach
hanh ve » hanh vi, hanh va, hanh kem
vu cham » va cham, vu kham, tu cham
ve su » va su

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) or (te sach)) ky nang xa hoi. hieu vu cham ((luu van) OR (luu hanh)) hanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky nang xa hoi. hieu vu cham ((luu van) OR (luu hanh)) hanh ve su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky nang xa hoi. hieu vu cham ((luu van) OR (luu hanh)) hanh ve su triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky nang xa hoi. hieu vu cham ((luu van) OR (luu hanh)) hanh ve su triet*.