Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
hanh va » hanh vi
xuc van » duc van, luc van, vuc van
hieu ve » hieu va, hieu van
su tien » su kien, su hien, tu tieng
hang ca » nang cao, hang tai, hang dau
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat sach)) ly ((hang ca) or (hang va)) hoi. hieu ve cam xuc van hanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ly ((hang ca) OR (hang va)) hoi. hieu ve cam xuc van hanh va su tien.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ly ((hang ca) or (hang va)) hoi. hieu ve cam xuc van hanh va su tien*.