Perhaps you should try some spelling variations:
thuoc sai » thuoc tai, thuoc san, thuoc sach
cham duc » pham duc, cham soc, pham duy
ve cham » va cham, ve chat, vu cham
cu tren » tu tren, dua tren
va hanh » van hanh, va thanh, va danh
ca tren » cau tren, la tren, co tren
hieu ve » hieu va, hieu van
sai ky » sac ky
cua te » cua tu
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sai ky nang o hoi. hieu ve cham duc va hanh vi ((cua te) or (((cu tren) or (ca tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sai ky nang o hoi. hieu ve cham duc va hanh vi ((cua te) OR (((cu tren) OR (ca tren)))).
• Adding a wildcard symbol may retrieve word variants: thuoc sai ky nang o hoi. hieu ve cham duc va hanh vi ((cua te) or (((cu tren) or (ca tren))))*.