Perhaps you should try some spelling variations:
nang doc » nang luc
va trien » va truyen, va thiet, va tuyen
su sach » so sach, vu sach
doc hoi » duoc hoi, hoc hoi, doc hai
truc va » thuc va, trung va
hanh va » hanh vi
sach 2 » sach y
2 nang » v nang
va vao » va van, va dao, va bao

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 2 nang doc hoi. lieu va vao ((truc va) or (thuc vat)) ((hanh va) OR (hang va)) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 nang doc hoi. lieu va vao ((truc va) OR (thuc vat)) ((hanh va) OR (hang va)) va trien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach 2 nang doc hoi. lieu va vao ((truc va) or (thuc vat)) ((hanh va) OR (hang va)) va trien*".