Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
quan hanh » quan thanh, quang thanh, quang khanh
hoc quan » hoc dan, tac quan, hoc phan
viec cac » vien cac, viec cua, viec lam
lai cua » dai cua, hai cua, lai chau
cac hoc » cach hoc, cac hop, bac hoc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
vi cua » vai cua, di cua

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 ((lang xa) or (nang ma)) hoi. hieu viec cac hoc quan hanh ((vi cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((lang xa) OR (nang ma)) hoi. hieu viec cac hoc quan hanh ((vi cua) OR (lai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((lang xa) or (nang ma)) hoi. hieu viec cac hoc quan hanh ((vi cua) or (lai cua)) tre*.