Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
tranh chua » tranh cua, tranh chap, trinh chu
hoc thuyet » hoc chuyen
cang thang » cong thanh, dang thanh
dong cang » dong bang, dong cong, dong cung
thang ban » hang ban, tang ban, thanh ban
hoc thuc » hoc huu
ban can » ban dan, ban hang, ban hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thuyet) or (hoc thuc)) sach - canh ((tranh chua) OR (trinh chuan)) dong cang thang ban can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thuyet) OR (hoc thuc)) sach - canh ((tranh chua) OR (trinh chuan)) dong cang thang ban can.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thuyet) or (hoc thuc)) sach - canh ((tranh chua) OR (trinh chuan)) dong cang thang ban can".
• Adding a wildcard symbol may retrieve word variants: ((hoc thuyet) or (hoc thuc)) sach - canh ((tranh chua) OR (trinh chuan)) dong cang thang ban can*.