Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
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
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve bao » te bao, va bao
va huu » vu 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: thu sach ty ((nang xa) OR (nang ma)) hoi. hieu ve bao hoc va hanh ((va huu) or (va chu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (nang ma)) hoi. hieu ve bao hoc va hanh ((va huu) OR (va chu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang xa) OR (nang ma)) hoi. hieu ve bao hoc va hanh ((va huu) or (va chu)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) OR (nang ma)) hoi. hieu ve bao hoc va hanh ((va huu) or (va chu)) tre*.