Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
trinh toan » tinh toan, thanh toan, trinh han
hoc thieu » toc thieu, hoc hien
trinh ban » trinh han, trinh san, trinh dan
nung hong » nung phong, dung hong, nung dong
anh juan » anh quan, anh xuan, manh tuan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((trinh ban) OR (trinh toan)) nung hong ((anh juan) OR (anh tuan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh ((trinh ban) or (trinh toan)) nung hong ((anh juan) OR (anh tuan)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trinh ban) or (trinh toan)) nung hong ((anh juan) OR (anh tuan)) cao*.