Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
trang cua » tang cua, trung cua, thang cua
tranh cua » doanh cua, manh cua
dung cong » dung trong
tac chuan » tac quan, tac cua, tac can
tac chay » tac cay, toan chay, tac pham

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu tinh - hanh ((trang cua) or (tranh cua)) dung cong ((tac chay) OR (tac chuan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - hanh ((trang cua) OR (tranh cua)) dung cong ((tac chay) OR (tac chuan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu tinh - hanh ((trang cua) or (tranh cua)) dung cong ((tac chay) OR (tac chuan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - hanh ((trang cua) or (tranh cua)) dung cong ((tac chay) OR (tac chuan)) cao*.