Perhaps you should try some spelling variations:
phuong thao » phuong phap, phuong thuc
lang phuong » bang phuong, lan phuong, lang phong
hieu lang » chieu sang, hieu quang, nhieu tang
hoi hieu » hoi phieu, hoi tieu, moi hieu
tang van » dang van, hoang van, trong van
thao san » thao van, tao san, thai san
tang va » trang va, thang va, tang vat
san ban » sang ban, van ban, can ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - hanh ((tang va) OR (tang van)) lang phuong thao san ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - hanh ((tang va) OR (tang van)) lang phuong thao san ban".
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh ((tang va) OR (tang van)) lang phuong thao san ban*.