Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach thu » sach thue, sach thieu, sach tham
thuc van » thuc vat, thuc dan, thuc va
truc van » truc va, truc ban, truc dan
hang vi » hang va, hanh vi, hang di
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ve cac » va cac, vien cac
vi su » va su, ve su, ki su

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 thu ((nang xa) OR (nang x)) hoi. hieu ve cac ((truc van) or (thuc van)) hang vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((nang xa) OR (nang x)) hoi. hieu ve cac ((truc van) OR (thuc van)) hang vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((nang xa) OR (nang x)) hoi. hieu ve cac ((truc van) or (thuc van)) hang vi su triet*".