Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
hoc sach » hoc sinh, hoc cac, hoc anh
thanh va » hanh va, thanh ha, thanh ve
lang xa » lang ha, dang xay, lang van
hieu va » lieu va
cam duc » cam xuc, cao duc, pham duc
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
cua te » cua tu

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

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