Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
su triet » su viet, su tien, ve triet
sach thu » sach thieu, sach tham, cach thuc
van hang » van khang, van hoang, van thang
hang ki » hang di, hang ke, hang vi
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve cam » ve cham, ve cac, va cam
ki su » ky 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) or (sach thue)) ((nang xa) OR (nang ma)) hoi. hieu ve cam tuc van hang ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach thue)) ((nang xa) OR (nang ma)) hoi. hieu ve cam tuc van hang ki su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thu) or (sach thue)) ((nang xa) OR (nang ma)) hoi. hieu ve cam tuc van hang ki su triet*".