Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
luc van » luoc van, duc van, luc va
luu van » cuu van, luan van, luu hanh
luu tre » luu tru, cuu tre, luy tre
ve cau » ke cau, va cau, ve cac
vi luu » vi lua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (thu hoach)) ky dang xa hoi. hieu ve cau ((luc van) or (luu van)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thu hoach)) ky dang xa hoi. hieu ve cau ((luc van) OR (luu van)) hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thu hoach)) ky dang xa hoi. hieu ve cau ((luc van) or (luu van)) hanh vi luu tre*.