Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cam truc » cau truc, nam truc, lam truoc
vanh dai » vanh tai, lanh dao, van dao
hanh dai » hanh tai, hanh dao, thanh dat
van dai » van dao, van hai, can dai
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
sach 2 » sach y
ve cam » ve cham, ve cac, va cam
2 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 2 nang xa hoi. hieu ve cam truc va ((hanh dai) or (((vanh dai) OR (van dai)))) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 nang xa hoi. hieu ve cam truc va ((hanh dai) OR (((vanh dai) OR (van dai)))) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach 2 nang xa hoi. hieu ve cam truc va ((hanh dai) or (((vanh dai) OR (van dai)))) su triet".
• Adding a wildcard symbol may retrieve word variants: su sach 2 nang xa hoi. hieu ve cam truc va ((hanh dai) or (((vanh dai) OR (van dai)))) su triet*.