Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
trinh van » trinh han, trinh quan, dinh van
hang cong » dang cong, hang nong, bang cong
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
trinh va » trinh vat, trinh ve, trinh vi
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu sach - hanh ((trinh va) or (((trinh van) OR (trinh toan)))) hang cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - hanh ((trinh va) OR (((trinh van) OR (trinh toan)))) hang cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sach - hanh ((trinh va) or (((trinh van) OR (trinh toan)))) hang cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: theo chu sach - hanh ((trinh va) or (((trinh van) OR (trinh toan)))) hang cong dan toan cau*.