Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, hinh tai
han tai » hang tai, nhan tai, van tai
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
cao hoi » cau hoi, co hoi, cao hoc
tuc va » thuc va, truc va, duc va
y nang » ky nang, ly nang, v nang

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