Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hanh tai » thanh tai, hang tai, han tai
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cao » van bao, van hao, van cau
cua te » cua tu

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 ky nang xa hoi. hieu ((van cao) OR (van dao)) suc manh hanh tai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((van cao) OR (van dao)) suc manh hanh tai ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((van cao) OR (van dao)) suc manh hanh tai ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((van cao) OR (van dao)) suc manh hanh tai ((dua tren) or (cua te))*.