Perhaps you should try some spelling variations:
va trien » va truyen, va tuyen, va tieng
te sach » toc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
hanh de » hanh ve, hanh kem
tuc va » thuc va, tuc xa, duc va
thiet » thieu

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 qua cam ((tuc va) or (truc va)) hanh de ((va trien) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu qua cam ((tuc va) OR (truc va)) hanh de ((va trien) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu qua cam ((tuc va) or (truc va)) hanh de ((va trien) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu qua cam ((tuc va) or (truc va)) hanh de ((va trien) OR (va thiet))*.