Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
tri cuu » tra cuu, trinh cuu, troi cua
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. hieu va cam ((tuc va) or (loc va)) hanh ((tri cuu) OR (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu va cam ((tuc va) OR (loc va)) hanh ((tri cuu) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu va cam ((tuc va) or (loc va)) hanh ((tri cuu) OR (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu va cam ((tuc va) or (loc va)) hanh ((tri cuu) OR (tri cua)) tre*.