Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hang cau » hang dau, hang ca, nhung cau
ty hang » ly hang, ty xang, thi hang
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
duoc va » nuoc va, duc va, duoc ma
va cua » va chua, via cua, ca cua
cua te » cua tu
ve tac » va tac, ve cac, ve tai
ve tao » ve bao, de tao, ve tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuat san)) ty hang cau hoi. hieu ((ve tao) or (ve tac)) duoc va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuat san)) ty hang cau hoi. hieu ((ve tao) OR (ve tac)) duoc va hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuat san)) ty hang cau hoi. hieu ((ve tao) or (ve tac)) duoc va hanh va cua te*.