Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
trinh va » trinh van, trinh vat, trinh ve
van tuan » anh tuan
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - hanh trinh va hang cong ((((van tuan) or (van quan))) or (van ban)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh trinh va hang cong ((((van tuan) OR (van quan))) OR (van ban)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh trinh va hang cong ((((van tuan) or (van quan))) or (van ban)) cau*.