Perhaps you should try some spelling variations:
van khanh » van thanh, van anh, van phan
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
cac xuc » cam xuc, cac nuoc, chat xuc
thai cu » thai cua, thai xu, thi cu
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cu tren » tu tren, dua tren
ve cac » va cac, vien cac
co hoi » co hoc, co loi
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ((co hoi) or (o hai)). hieu ve cac xuc ((van khanh) or (van hanh)) thai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((co hoi) OR (o hai)). hieu ve cac xuc ((van khanh) OR (van hanh)) thai cu tren.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((co hoi) or (o hai)). hieu ve cac xuc ((van khanh) or (van hanh)) thai cu tren*.