Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
hieu vu » hieu ve, hieu su, dieu vu
ty lang » tay lang, ty xang, ty hang
soc va » loc va, doc va, goc va
cua tu » cua tuc, cua su, cua cu

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 hoi. ((hieu vu) OR (hieu va)) cham ((soc va) or (hoc va)) hanh thai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang xa hoi. ((hieu vu) OR (hieu va)) cham ((soc va) OR (hoc va)) hanh thai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty lang xa hoi. ((hieu vu) OR (hieu va)) cham ((soc va) or (hoc va)) hanh thai cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. ((hieu vu) OR (hieu va)) cham ((soc va) or (hoc va)) hanh thai cua tu*.