Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
su triet » su viet, su tien, ve triet
cam truc » cau truc, nam truc, lam truoc
vanh dai » van dai, vanh tai, lanh dao
hanh dai » hanh tai, hanh dao, thanh dam
vu sach » vu bach, su sach, vu khach
truc va » thuc va, thuc vat, trung va
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, va cam
v nang » va nang, vu nang, van nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach v nang xa hoi. hieu ve cam truc va ((((hanh dai) OR (thanh dat))) or (vanh dai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach v nang xa hoi. hieu ve cam truc va ((((hanh dai) OR (thanh dat))) OR (vanh dai)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach v nang xa hoi. hieu ve cam truc va ((((hanh dai) OR (thanh dat))) or (vanh dai)) su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach v nang xa hoi. hieu ve cam truc va ((((hanh dai) OR (thanh dat))) or (vanh dai)) su triet*.