Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
dau cua » dai cua, day cua, cau cua
tu tren » tu truyen, tu tieng, tu trong
co hoi » co hoc
tuc va » thuc va, truc va, tuc xa
va dau » va dao
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang ((co hoi) or (co loi)). hieu van cam tuc va dau cua tu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((co hoi) OR (co loi)). hieu van cam tuc va dau cua tu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((co hoi) or (co loi)). hieu van cam tuc va dau cua tu tren*.