Perhaps you should try some spelling variations:
thuat lanh » thuat lap
thuat san » thuat toan, thuat song, thuat xay
cach hoc » cach thuc, cach thoi, dich hoc
hieu ve » hieu va, hieu van
cac hoc » cac hop, bac hoc, cac toc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
y nang » ky nang, ly nang, v nang
di qua » di cua, di quanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat lanh) or (thuat san)) y nang x ho. hieu ve ((cac hoc) OR (cach hoc)) va hang di qua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat lanh) OR (thuat san)) y nang x ho. hieu ve ((cac hoc) OR (cach hoc)) va hang di qua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat lanh) or (thuat san)) y nang x ho. hieu ve ((cac hoc) OR (cach hoc)) va hang di qua su".
• Adding a wildcard symbol may retrieve word variants: ((thuat lanh) or (thuat san)) y nang x ho. hieu ve ((cac hoc) OR (cach hoc)) va hang di qua su*.