Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
van hac » van hoc, van ha, van hai
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca cua
cua te » cua tu
ac va » tac va, bac va, mac va

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 van hac ((ac va) or (duc va)) hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (nang ma)) hoi. hieu van hac ((ac va) OR (duc va)) hanh va cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang xa) OR (nang ma)) hoi. hieu van hac ((ac va) or (duc va)) hanh va cua te*".