Perhaps you should try some spelling variations:
khanh vai » khanh van, hanh vi, hanh va
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
hoc dai » hoc dan
hoc dat » hoc dan, hoc phat, hoc chat
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
hieu vu » hieu ve, hieu su, dieu vu
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh
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 ty ang xa hoi. ((hieu vu) or (hieu va)) cham ((hoc dat) OR (hoc dai)) khanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ang xa hoi. ((hieu vu) OR (hieu va)) cham ((hoc dat) OR (hoc dai)) khanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ang xa hoi. ((hieu vu) or (hieu va)) cham ((hoc dat) OR (hoc dai)) khanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ang xa hoi. ((hieu vu) or (hieu va)) cham ((hoc dat) OR (hoc dai)) khanh vai cua te*.