Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
va thanh » gia thanh, ban thanh, va tinh
hoc sach » hoc sinh, hoc cac, hoc anh
hieu ve » hieu va, hieu van
ve cach » va cach, ve cac, ve canh
va hanh » van hanh, va danh, ban hanh
vi cua » vai cua, di cua
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 y ((nang x) or (nang cao)) hoi. hieu ve cach thuc ((va hanh) OR (va thanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((nang x) OR (nang cao)) hoi. hieu ve cach thuc ((va hanh) OR (va thanh)) vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y ((nang x) or (nang cao)) hoi. hieu ve cach thuc ((va hanh) OR (va thanh)) vi cua te*".