Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
trinh cac » trinh cau, trinh chat, trinh chao
tuong dan » huong dan, xuong dan, truong dai
quang cao » quang nam
tung dan » dung dan, huong dan, trung dai

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 tinh - hanh trinh cac ((tuong dan) OR (tung dan)) tran ((quang cao) or (nang cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - hanh trinh cac ((tuong dan) OR (tung dan)) tran ((quang cao) OR (nang cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - hanh trinh cac ((tuong dan) OR (tung dan)) tran ((quang cao) or (nang cao))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - hanh trinh cac ((tuong dan) OR (tung dan)) tran ((quang cao) or (nang cao))*.