Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, mang may
hieu va » lieu va, hieu qua
va cham » va chat, va tham
xuc va » tuc va, luc va, xac va
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 ((nang ma) OR (nang cao)) hoi. hieu va cham ((xuc va) or (duc va)) hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang ma) OR (nang cao)) hoi. hieu va cham ((xuc va) OR (duc va)) hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang ma) OR (nang cao)) hoi. hieu va cham ((xuc va) or (duc va)) hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang ma) OR (nang cao)) hoi. hieu va cham ((xuc va) or (duc va)) hanh dai cua te*.