Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
van hanh » van thanh, ban hanh, van anh
sach thu » sach thieu, sach tham, cach thuc
hanh va » hang va, hanh vi
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
nang ma » tang ma, sang ma, nang cao
chu tre » cho tre, chu tri, cuu tre
nang xa » nang x, lang xa, mang xa
va cam » va cham, va cac, va cao
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 thue) or (sach thu)) ((nang xa) OR (nang ma)) hoi. lieu va cam duc van hanh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach thue) OR (sach thu)) ((nang xa) OR (nang ma)) hoi. lieu va cam duc van hanh va chu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach thue) or (sach thu)) ((nang xa) OR (nang ma)) hoi. lieu va cam duc van hanh va chu tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach thue) or (sach thu)) ((nang xa) OR (nang ma)) hoi. lieu va cam duc van hanh va chu tre*.