Perhaps you should try some spelling variations:
dang hanh » dang thanh, ban hanh, dang van
cham hoc » cham soc, chat hoc, cham hoi
hoc dang » hoc dan, hoc dung, hoc bang
te sach » toc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu vu » hieu ve, dieu vu, hieu qua
hieu su » hieu sau, tieu su, hieu so
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
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: te sach ty xang xa hoi. ((((hieu vu) or (hieu su))) or (hieu va)) cham hoc dang hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang xa hoi. ((((hieu vu) OR (hieu su))) OR (hieu va)) cham hoc dang hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. ((((hieu vu) or (hieu su))) or (hieu va)) cham hoc dang hanh vi cua te*.