Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
lang van » dang van, tang van, hoang van
va hanh » van hanh, va thanh, va danh
bao hoc » bai hoc, bao goc, bac hoc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay
ve bao » te bao, va bao
vu huu » vu huy, tu huu
va chu » va che, va cau, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty ((lang xa) OR (lang van)) hoi. hieu ve bao hoc va hanh ((vu huu) or (va chu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty ((lang xa) OR (lang van)) hoi. hieu ve bao hoc va hanh ((vu huu) OR (va chu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty ((lang xa) OR (lang van)) hoi. hieu ve bao hoc va hanh ((vu huu) or (va chu)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty ((lang xa) OR (lang van)) hoi. hieu ve bao hoc va hanh ((vu huu) or (va chu)) tre*.