Perhaps you should try some spelling variations:
cao trung » cao truong, tao trung, bao trung
trung va » truong va, trang va, trung ha
tay lang » tai lang, tay tang, tay quang
hieu ke » hieu kem, chieu ke, hieu ky
ky tang » ky nang, ky dang, kho tang
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
ca tren » cau tren, cu tren, co tren
la tren » loai tren, dua tren, dat tren
ke cao » ke cau, ke co, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh ((tay lang) or (ky tang)) xa hoi. hieu ke cao trung va danh vi ((ca tren) OR (la tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh ((tay lang) OR (ky tang)) xa hoi. hieu ke cao trung va danh vi ((ca tren) OR (la tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh ((tay lang) or (ky tang)) xa hoi. hieu ke cao trung va danh vi ((ca tren) OR (la tren))".
• Adding a wildcard symbol may retrieve word variants: hoc sinh ((tay lang) or (ky tang)) xa hoi. hieu ke cao trung va danh vi ((ca tren) OR (la tren))*.