Perhaps you should try some spelling variations:
trung ha » trung hoc, trung tam, trung cap
su sach » so sach, vu sach
hang vi » hang va, hanh vi, hang di
ha hang » nha hang, ha tang, va hang
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, ve cai
co hoi » co hoc, co loi
y nang » ky nang, ly nang, v nang
cua te » cua tu
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((co hoi) or (o hoc)). hieu ((ve cam) OR (va cam)) trung ha hang vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((co hoi) OR (o hoc)). hieu ((ve cam) OR (va cam)) trung ha hang vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((co hoi) or (o hoc)). hieu ((ve cam) OR (va cam)) trung ha hang vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((co hoi) or (o hoc)). hieu ((ve cam) OR (va cam)) trung ha hang vi cua te*.