Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
duc tren » duoc tren, dua tren, duc tien
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
ve cham » va cham, vu cham, ve chim
ve chat » va chat, van chat
soc gia » toc gia, hoc gia, so gia
du tren » dua tren, dau tren, tu tren
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 xa hoi. hieu ((ve cham) or (ve chat)) soc gia thanh vi ((du tren) OR (duc tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu ((ve cham) OR (ve chat)) soc gia thanh vi ((du tren) OR (duc tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu ((ve cham) or (ve chat)) soc gia thanh vi ((du tren) OR (duc tren))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu ((ve cham) or (ve chat)) soc gia thanh vi ((du tren) OR (duc tren))*.