Perhaps you should try some spelling variations:
va tuyen » va truyen, tac tuyen, ke tuyen
va trien » va truyen, va thiet, va tieng
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
tuc va » thuc va, truc va, duc va
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi

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. hieu va cac ((tuc va) or (tuc xa)) hanh dai ((va trien) OR (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang co hoi. hieu va cac ((tuc va) OR (tuc xa)) hanh dai ((va trien) OR (va tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang co hoi. hieu va cac ((tuc va) or (tuc xa)) hanh dai ((va trien) OR (va tuyen))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang co hoi. hieu va cac ((tuc va) or (tuc xa)) hanh dai ((va trien) OR (va tuyen))*.